Free-standing urethane/urea elastomer films undoped and doped with ferro-nano-particlesC. Sena, M.H. Godinho, P.J. Sebastião, D. Sousa and A.M. Figueiredo NetoEur. Phys. J. E, 34 1 (2011) 8DOI: https://doi.org/10.1140/epje/i2011-11009-8